Dust-guard.



' PATENTED NOV. 28, 1905.

E. DBNEGRE.

DUST GUARD. APPLICATION PI'LED JAN. 7, 1904.

UNITED STATES PATENT OFFICE.

EDWARD DENEGRE, OF CHICAGO, ILLINOIS, ASSIGNOR TO h [cCORD & COM- PANY, OF CHICAGO, ILLINOIS, ACORPORATION OF NEW JERSEY.

DUST-GUARD.

Specification of Letters Patent.

Patented Nov. 28, 1905.

Application filed January '7, 1904:. Serial No. 188.040.

To all whom it may concern.-

Be it known that I, EDWARD DENEGRE,a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois,

have invented certain new and useful Improvements in Dust-Guards; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which to it appertains to make and use the same.

My invention has for its object to provide an improved dust-guard for car-axle boxes; and to this end the invention consists of the novel devices and combinations of devices hereinafter described, and defined in the claims.

Theinvention is illustrated in the accompanying drawings, wherein like notations refer to like parts throughout the several views.

In said drawings, Figure 1 is a view, chiefly in longitudinal section, but with some parts shown in elevation, some portions broken away, and some parts removed, illustrating my improved dust-guard in working position. Fig. 2 is a section on the line 00 m of Fig. 1. Fig. 3 is a horizontal section on the line 00 m of Fig. 2, some parts broken away. Fig. 4is a sectional view on the line :0 m of Fig. 2, with the packing-ring, the spring, and the guard-plate detached from the box and pulled apart from each other. Fig. 5 is a view in elevation, showing the sectional packing-ring detached; and Fig. 6 is a view in end elevation, showing the spiral helical spring detached.

The reference-letters a, a, and a represent the axle, a denoting the body portion, a the journal, and a the intermediate part subject to the dust-guard.

The box 6 may be of the usual or any suitable construction and is provided with a raised boss Z2, surrounding the rear end opening or axle-passage of the box and having a machined or planed face serving as a joint surface to be packed. The box I) is also provided with lock-flanges b at the sides of its rear end. The reference-letters b and 5* repand the key,

has the customary central opening for the passage of the axle, and the body portion of said guard-plate is of cup shape in cross-section, as best shown in Figs. 1, 3, and 4.

The packing-ringd is of sectional form, being shown as composed of three sections, and all thereof are provided with lap-joints d. (Best shown in Figs. 4 and 5.) The hub of the packing-ring d has a portion (Z adapted to fit the axlepassage in the guard-plate, a shouldered portion (Z serving as a seat for the outer end of the spiral helical spring 0, a flat portion el serving as the seat for the large or inner end of the spring 0, and a beveled portion (Z intermediate the portions (Z7 and CF. The inner profile face of the packing-ring cl is machined or planed for cooperation with the planed boss 6 on the axle-box when the parts are in working position. Said packing-ring is preferably composed of gray iron, as practice has demonstrated that to be the best material, but may of course be composed of any other suitable material. The packing-ring is interposed between the guard-plate and the box and is adapted to pack both the box and the axle. The spiral helical spring a is interposed between the packing-ring and the guard-plate and is applied under compression. Otherwise stated, when the hook-like ear-lugs c of the guardplate 0 are made to engage with the lockflanges Z2 of the box the spring 6 will be compressed between the guard -plate and the packing ring and will serve yieldingly to clamp the dust-guard to the box and to hold the packing-ring in proper packing position both in respect to the box-surface and the axle-surface to be packed thereby. Otherwise stated, when the parts are in working position the spring 6, in Virtue of its spiral helical form, in cooperation with the beveled surface d on the sectional packing-ring (Z, will operate in a double way on'the packing-ringto wit, in an axial directionto force the packing-ring against the boss 6 of the boxsurface to be packed thereby and in a radial direction, tending to force the sections of the packing-ring together, or against the axle-surface packed thereby.

The third function of the spring has already been notedto wit, yieldingly to clamp the dust-guard to the box when the parts are in working positionand it should further be noted that the tension of the spring 6 when so compressed in working position is such that under the friction from the clamping action the weight of the entire dust-guard will be carried by the box, thereby relieving the axle from any wear and tear which would otherwise be incidental to the relation of the parts if the load thereof was carried by the ax e.

With the improved dust-guard above de scribed it must of course be obvious that as rapidly as any wear and tear takes place on the inner surface of the packing-ring the sections of the ring will simply be forced closer together under the radial tension of the spring a, while at all times the inner face of the packing-ring will be held tightly against the boss or box-surface b, packed thereby under the axial tension of the spring. It must be equally obvious that this dust-guard is free to move with the axle in respect to the box under the motions incidental to the service. Hence all the conditions are met, and the surfaces to be packed, both as to the box and as to the axle, are always tightly hugged by the packing-ring (Z. A perfect dust-guard is thus secured.

By actual usage the efficiency of the dust guard above described has been fully demonstrated.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

1. The combination with a journal-box, of a guard-plate having means for detachable engagement with the box, a sectional packing-ring interposed between the guard-plate and the box and adapted to pack both the box and the axle, and a spiral helical spring located between the guard-plate and the packand the box and adapted to pack both the box and the axle, which packing-ring is provided with both flat and beveled spring-seating surfaces, and a spiral helical spring located between the guard-plate and the packingring and operating yieldingly to clamp the dust guard to the box and to deliver its tension on the packing-ring both in an axial and in a radial direction, thereby causing the ring to hug both the box and the axle surfaces to be packed thereby, substantially as described.

3. The combination with a journal-box having lock-flanges 6 of the guard-plate 0 having the hook-like lugs c for engagement with said lock-flanges b of the box, the sectional packin g-ring d, having the spring-seating surfaces (Z 6Z4, and (P, as described, and the spiral helical spring 0 interposed between the packing-ring and the guard-plate, and applied under compression when the parts are in working position, substantially as and for the purposes set forth.

In testimony whereofIaflix my signature in presence of two witnesses.

EDWARD DENEGRE.

Witnesses:

H. D. HOUGHTALING, JAMEs D. DENEGRE. 

